Machine for boring metal.



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MACHINE FOR BORING METAL.

(Application filed Apr. 24, 1899.)

4 Sheets-Sheet I,

(No Model.)

15m/www" HK L ee,

THE nanars varias co, Fumo-urne, WASHINGTON. n. c.

No. almas. Patented 1an. so, |900. H. K. LEE.

MACHINE FDR BORING METAL.

(Application filed Apr. .24, 1899.)

4 Sheets-Sheet 2.

Patented 1an. 30, |900. H. K. LEE.

MACHINE FOR BORSNG METAL.

(Application filed Apr. 24, 1899.)

4 Sheets-Sheet 3.

(No Model.)

No. 642,52@ Patented an. 30, |900. H. K. LEE.

MACHINE FOR BORING METAL.

(Applicaion led Apr. 24, 1899.) (No Moden.) 4 sheets-sheet 4.

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HENRY K. LEE, OF HARTFORD, CONNECTICUT.

MACHINE FOR BORING METAL.

SPECIFICATION forming part of Letters Patent No. 642,138, dated January 30, 1900.

Application filed April 24, 1899. Serial No. 714,153. (No modeLl T0 (LZ/ tch/0m t may concern:

Be it known that l, HENRY K. LEE, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Machines for Boring Metal, of which the followingis a specification.

This invention relates to machines for boring cylinders; and it has for one of its objects the provision of a machine of this character which may readily be placed in position and adjusted with accuracy and rapidity.

Further objects of the invention are to provide improved means whereby the cutter head of a boring-bar may be fed automatically in either direction during the boring operation and to provide an improved construction of the boring-bar and appurtenances thereof by which it maybe retained in position on cylinders of different sizes, as will hereinafter appear.

In the accompanying drawings, Figure 1 represents a horizontal sectional View of a cylinder with a boring-bar of improved construction inplace within the same. Fig. 2 is a vertical longitudinal section of a cylinder, showing a side view of the boring-bar witha part thereof broken away. Fig. 3 is an end view looking from the left of Fig. 2. Fig. 4; is a cross-section of the boring-bar, taken on line a 4 of Fig. 2. Fig. is a section of the cutter-head, taken on line 5 5, Fig. 4; and Fig. 6 is a vertical longitudinal section of the feed end of the bar. Fig. 7 is a perspective view of the center spindle and its appurtenances. Figs. 8 to l0, inclusive, are detail views of parts of the cutter-head; and Fig. l1 is a detail view of one form of the sectional ball.

My improved boring-machine, although adapted, as above stated, for boring the cylinders of engines, dac., is especially intended for reboring a cylinder after it has become worn until the inner surface is in an outottrue77 condition, and hence said machine embodies means whereby it may be accurately placed in position on a cylinder without removing the latter from its foundation and which in connection with the boring-bar constitutes a complete portable apparatus.

In Figs. 1 and 2 of the drawings, C represents the cylinder of an engine or similar machine, and B designates in a general way the boring-bar, a head of said cylinder being re'm moved to permit the bar to be placed in p0- sition and said bar consisting of a shaft 10, countersunk at its rear end, as at 1l, to receive a center spindle 12, by which the bar is pivotally supported in the head of the cylinder.

In connection with one end of the cylinder I employ a device adapted to lit stuffing-boxes of various sizes and which may be applied to the cylinder by the usual bolts which secure the stuffing-box gland in position, said device serving to retain the center in place andas a convenient means whereby the same may be adjusted. In the form illustrated this device consists of a block having a series of concentric steps or shoulders of various sizes; but the invention is not limited to the precise construction shown, for, as is obvious, these steps or shoulders may be interrupted or the block may be provided with other means to accomplish the result desired.

A bushing 13, having an aperture corresponding with the size of the center l2, is tightly tted in a passage 14 of the cylinder, through which the piston-rod loosely passes, which passage leads to the interior of the stufting-boX l5, adapted to receive the usual gland. After the removal of this gland a block 16, having the ears 16a thereof engaged by the nuts 17 on the glandsecuring bolts 18, the latter being screw-threaded into the cylinder-head, is placed in position. This block 16 is represented having a series of steps 1Gb, adapted to stufl'ingboxes of different sizes; but it is evident, as above stated, that other means may be employed to provide a firm seat for the same therein. In the construction of the engine the passage 14 and the interior of the stuffing-box are bored out in true alinement with the center line of the cylinder, and as generally there is no wear on the parts mentioned it is evident that the center spindie l2 will also be in true alinement therewith, said spindle being` screw7threaded, as at 12, to engage a corresponding screw-thread in a bushing 1S), which is tightly fitted in the block 16 and has a liange 19 at its front end for withstanding the thrust to which the center is subjected by the weight of the bar on its conical end. A squared portion 1.2i is IOO formed at the outerend of the center 12 to receive a wrench for properly adjusting 'the same in the bushing 19, and a check-nut 12c serves firmly to hold it in adjusted position. It has been found in practice that the point of the center spindle is frequently ruined for lack of proper lubrication and that consequently its efficiency in producing true work is greatly impaired, a defect which it is difficult to remedy on account of the inaccessibility of the center, and for this reason a chamber 2O is formed in the end of the boringbar, which may serve as a reservoir for oil or other lubricant supplied thereto through a passage 12d in the center spindle, said passage being preferably connected with an oilcup 21 by the pipe 22, so that the center point may be constantly lubricated, as will be readily understood.

Near its front end the shaft 10 carries a ball-shaped member (designated in a general way by 5,) preferably consisting of two sections b' b, (see Fig. 6,). said sections surrounding the shaft and being clamped together and in place thereon by countersunk bolts 23 in central alinement at right angles to the axis of the shaft 10, while one of the sections, as h", carries a key 24, adapted to slide in a longitudinal groove 25, formed in the shaft 10 and extending from end to end thereof, so that the ball member h may be adjusted on the shaft as desired. It will be observed that by this construction the ball member is clamped to the shaft with an even and equal pressure at every point on the circumference of the same and that therefore there is no liability of distorting or springing the shaft, and thereby'throwing it out of alinement,which sometimes happens when the ball is clamped thereto by a screw or otherwise at but a single point. Furthermore, another great advantage is gained by constructing the ball member h in two separate sections, inasmuch as a solid ball must necessarily have an opening sufficiently large to permit a free sliding movement of the shaft therein for adjustment, so that a certain amount of looseness between the shaft and ball cannot be avoided. If, now, a set-screw or other analogous device is employed for setting the ball on the shaft, it is evident that the axes of said ball and shaft will be thrown out of alinement. By forming the ball in two sections andclamping the same firmly in place said ball may be turned in a lathe when in position on the shaft, so that no matter to what position longitudinally thereon the ball may be adjusted the axes of both ball and shaft will always be in true alinement, and consequently the axis of the shaft will not describe a cone-face. during the operation of the bar, which cannot be avoided when a loose 'fit exists between the central bore of the bar and the sh aft retained therein. The member b serves as a universal bearing for the shaft 10 in a correspondingly-shaped journal-box 26, having an annular groove 27 in alinement with the clamp-bolts 23, above referred t, said groove forming a channel for retaining a lubricant, which by the rotation of the shaft 10 and ball member b will be conveyed around inthe journal-box by the walls of the counterbores for said bolts 23.

The bearing-face of the journal-box 26 is composed of two circular linings 28 28a, one on each side of the annular groove 27, said linings being so arranged that the greater part of the end thrust of the bar will be carried thereby, as Will be readily understood by referring to Fig. 6, and as said linings are kept in a constant state of lubrication, as above stated, the wear on the ball member b is reduced to the minimum.

The journal-box 26 forms a part of a yoke having oppositely disposed arms 50 50', whereby the front end of the bar is supported on the cylinder to be bored, said arms being held in brackets 51 5l', having web portions 51, against which the arms may be clamped by bolts 5-2 52', carried in slots 50n in said arms, and the nuts 52a in engagement with said bolts. Each of the brackets 51 is provided with a slotted foot-plate 51h, and each bracket may be secured to the cylinder by the bolts 5lc ordinarily employed for retaining the removable cylinder-head in place, and in order to provide means for readily and accurately centering the boring-bar within the bore of the cylinder the brackets 5l 5l' are equipped with ears 51d for the reception of screws 51e, whereby each of the arms 50 50 may be adjusted vertically individually, while the lateral adjustment of the yoke as a whole may be made by means of the screws 53a in threaded engagement with blocks 5.3, which are adjustably secured to the yokearms 50 by bolts 53", (see Fig. 1,) said screws 5 3a having their inner ends in engagement with the sides of the web portions 51:l of said brackets 51 51. Depending from the journal-box 26 and also forming a part of the yoke is an arm 50", carrying at its lower end a bracket 54, provided with the journal-boxes 54C for a shaft 55, to which rotary movement may be imparted by a belt (not shown) pass ing over a pulley 56, and on said shaft is mounted a worm 56, engaging a worm-gear 57, secured to the boring-bar shaft 10. The hub of the gear 57 is split, as shown in Figs. 1 and 6, and bolts 57a are employed for clamping the gear to the shaft, while a key 57b serves for retaining said gear in operative relation therewith, the said key being prevented from endwise movement by one of the bolts 57a (see Fig. 6) and having a longitudinal aperture formed therein for the free passage of the lead-screw 35, to be hereinafter de scribed. By clamping the gear 57to the boring-bar shaft in the manner shown the hub thereof bears with equal pressure on all parts of the circumference of said shaft, and all danger of deflecting the shaft at its power end is overcome.

Mounted on the shaft 10 and adapted to IOO IIO

slide longitudinally thereon is a cutter-head, (designated in a general way by l-L) said head consisting, substantially, of a collar 30, having an axial bore 3l of slightly-greater diameter than that of the shaft l0 and carrying a series of shoes 32, which are adapted to engage said shaft l0 (see Fig. et) and each of which may be adjusted in contact-pressure therewith by means of screws 33, having their inner ends pointed to enter correspondinglyformed seats in the shoes, whereby the latter are caused to move with the collar during its travel along the bar, while a nut 34, carried within a recess 301 of the collar 30, projects into the longitudinal groove 25 of the shaft l0 and serves as a key for rotating the head H in unison therewith. The nut 34 is provided with a stud or projection 34, entering an aperture 30a in the collar 30, and is in threaded engagement with the lead-screw 35,- so that when said screw is rotated, as hereinafter described, the head ll will be moved longitudinally on the shaft 10. In the drawings the cutter-head is shown carrying two cutting-tools of similar construction, so that the following description will apply equally to either of them. To the periphery of the collar 30 is secured by screws 36EL an inten changeable arm or bracket 36, provided at its front face with a groove 36h, (see Fig. 1,) located near the edge thereof and: adapted to receive in sliding contact a rib 37a, formed on the radially-adjustable shoe 37, which carries a clamping-screw 37b, extending through a slot 3Gc in the arm 36 and serving to hold said shoe firmly in adjusted position thereon. (See Figs. l and Both of the arms 36 are detachably secured to the collar 30 in order to adapt the bar to receive interchangeable arms of different sizes to enable it to be employed with cylinders of various proportions.

The shoe 37 is provided near its inner end with ears 37', which are adapted. to receive frictionally between them the tool-holder 33, pivoted to said shoe by a pin 39 and having a tongue 33 iitting in a groove provided therefor in the front face of the shoe 37. In the side of the said toolholder is formed a groove adapted to receive a corresponding tongue of the cutting-tool T, which may be secured in place by a binding-screw 40, passing through a slot 33 in the holder 33, which is provided with a lug 33b for retaining a screw 33C and its check-nut 33, whereby the tool T may be radially adjusted and supported during the cutting operation. By referring to Fig. i it will be noticed that the pivot-pin 39 of the tool-holder is located in the rear of a radial line drawn from the cutting edge of the tool, so that when the holder is swung forward the distance from the cutting edge of the tool to the center of the shaft will be lessened, and consequently a lighter chip will be cut, and it will of course be understood that the reverse is true when the holder 33 is permitted to swing in a rearward direction. For the purpose of gaging the cut of the tool by the swinging movement of the holder, as just described, I provide a screw 4l in threaded enga-gement with the said holder and resting against the shoe 37, so that by rotating said screw the holder may be swung forward or permitted to swing rearward, as desired, and a checknut may be employed to lock said screw against rotation, so that by these means a very tine adjustment relatively to the size of the chip to be cut may be had.

Means are employed for ad vancing the cutter-head H in either direction during a continuous cutting operation, such means consisting, substantially, of the lead-screw 35 in threaded engagement with the nut 34 above referred to and having at its end a reduced portion 35a, which is journaled in a collar 60, rigidly secured to the boring-bar shaft 10 and which carries a washer 35D and a nut 35C, whereby said screw is prevented from endwise movement. At the forward end of the shaft lO is secured a disk 6l, in which the lead-screw 35 is journaled, (see Fig. 6,) and the projecting end of said screw carries a pinion 62, attached thereto by a pin 62a, the hub of which pinion is adapted to receive the hub of a starwheel 63 for imparting intermittent rotary movement to the screw 35, said star-wheel being held in place by a set-screw 63 and being adapted to be similarly placed on the hub of another pinion 64, which is journaled on a stud 64, the centers of both pinions being arranged equidistant from the axis of the shaft 10, (see Fig. 3,) so that the star-wheel may be properly actuated when attached to either pinion mentioned. It is of course obvious that when the star-wheel is attached to the hub of the pinion 62 the screw will be driven in one direction and that when said wheel is attached to pinion 64 the rotation of the screw 35 will be reversed, so that the cutterhead may be moved longitudinally on the shaft in either direction, according to the position of the star-wheel on either of the pinions above mentioned, or a hand-crank maybe applied to either pinion-hub for accelerating the movement of the cutter-head in the desired direction. The means provided for actuating the star-Wheel may be of any wellknown construct-ion; but l prefer to employ one or more rollers 65, journaled on studs 65, which are secured to a stationary frame 66, having an annular bearing-face 66L (see'Fig. 2) for rcceiving the disk 6l and an arm 66h, Fig. 3, which carries a split stud 66C, having an opening for receiving the stop-rod 67,v clamped therein by a binding-screw 63 and serving to prevent undue movementof the arm 66h, and consequently of the rollers 65, as will be readily understood.

The advantages of my improved boring-bar are manifest, sinceit may be adapted to many varieties of work by virtue of its adj ustability to different requirements, and the several parts being of great simplicity as regards construction and operation accurate work may lOO IIO

be done rapidly particularly as by the reversal of the movement of the lead-screw I am enabled to obviate the defect of boring the cylinder larger at one end than at the other end, (a result Which is due to the Wear of the tool but when after a cut has been taken in one direction the tool takes another cut in the other direction the last cut Will remedy the defect caused by the first, so that a true surface throughout the cylinder will be obtained. Furthermore, a cutter-head of the improved construction described is particularly advantageous for the reason that the motion of the screw may be reversedand a cut taken the entire length of the bore of the cylinder on both the forward and return movements of the cutting-tool; but if the cylinder requires but slight repairs, which may be finished at one complete movement of the tool, the cutterholder may readily be swung to such position that the tool Will not come into contact with the Wall of said cylinder on the return movement of the tool.

In Fig. Il I have illustrated another form of the ball member consisting of a split ball b to be secured to the boring-bar sha ft by a bolt or bolts 23X, the two divisional or sectional portions of said ball being designated by b20 and b21. This form of ball member may be readily clamped in position on the boringbar shaft and Will bear upon said shaft at all points of its circumference in the same manner as the other ball member above described. It is therefore distinctly to be understood that the term sectional as employed in this specification is intended to cover either of the ball members illustrated.

Many changes may be made in the construction of the various parts of the machine Without departing from the spirit of the invention, and the invention is not limited to the exact details thereof illustrated and described.

Having thus described myinvention, what block having surfaces adapted to fit various sizes of openings in cylinders; and a nut carried by said block and in engagement with the thread of said center.

3. In a machine of the class specified, the combination with a boring-bar and with means foractuating the same, of a cutter-head on said boring-bar; a screw-threaded center; a bushing fitted on said center and adapted to i I e-ialss fit the opening for the piston-rod in the cylinder; a block having a series of steps for fitting various-sized openings in cylinders; and a fianged nut mounted in said block and in engagement with the thread of said center.

4. In a machine of the class specified, the combination, with a boring-bar shaft, of a split or divided ball member adapted exactly to fit said shaft; and means for clamping the ball member to the shaft, whereby said ball member engages the shaft at all points around the circumference thereof.

5. The combination, with a boring bar shaft, of a split or divided ball member adapted snugly to fit and engage the same at all points around its circumference; a journalbox for receiving said ball member; and means for adjusting said journal-box, and consequently the ball member, longitudinally of the boring-bar shaft.

In a machine of the class specified, the combination with a boring-bar shaft of a split or divided ball member attached thereto means for clamping said ball member to the shaft at all points around the circumference thereof; a sectional j ourn al-box for receiving said ball member provided with a groove for the reception of a lubricant; and linings at the sides of said groove and fitting upon the periphery of the ball member.

7. In a machine of the class specified, the combination with a boring-bar shaft of a split or divided ball member clamped thereto at all points around the circumference of said shaft; and a tubular key fitted in grooves of the ball member and boring-bar shaft.

8. In a machine of the class specified, the combination With a boring-bar shaft of a split or divided ball member clamped theretoat all points around the circumference thereof; bolts for clamping said member to the shaft; a tubular key carried by one of the sections of the ball member and engaging a groove in said shaft; a sectional journal-box for sustaining said ball member; and means Within said journal-box for permitting the constant lubrication of the ball member, substantially as and for the purpose specified.

9. In a machine of the class specified, the combination With a boring-bar shaft of a split or divided ball member; means for clamping the same to the shaft at all points around the circumference thereof; a tubular key carried by the ball member and engaging a groove in said shaft; a journal-box for sustaining said ball member; a cutter-head carried by the boring-bar shaft; and a screw passing through said tubular key and adapted to feed said cutter-head to its Work.

lO. In a machine of the class specified, the combination with a boring-bar shaft of a split or divided ball member adj ustably secured to said shaft and clamped to the same at all points around its circumference; a journalbox in which said ball member is mounted; a key carried bythe ball member and fitting a groove in the shaft; a feed-screw loosely fit- IOO IIO

ted in said key; and gearing for intermittingly actuating said feed-screw.

ll. In a machine of the class specified, the combination with a boring-bar shaft of a cutter-head mounted thereon; a device for feeding said cutter-head to its work; gearing for actuating said feed device in either direction; a star-wheel adapted to be fitted to any member of said gearing; and means carried by the framework for actuating said star-Wheel and thereby intermittingly turning the feed device as the shaft of the boring-bar rotates.

l2. In a machine of the class specified, the combination with a boring-bar shaft andwith means for sustaining and for operating the same, of a boring-tool carried by said shaft; a device mounted on the end of the shaft; a feed-screw one end of which passes through said device; a gear attached to said feedscreiv; a second gear mounted on the device above mentioned; a star-wheel having a hub adapted to be attached to either of said gears; and means for intermittingly actuating said star-Wheel as the shaft rotates.

13. In a machine of the class specified, the combination with a boring-bar shaft having a longitudinal groove or keyway of a cutterhead mounted on said shaft and carrying a boring-tool; a feed-screw; a nut having a stud fitted in the cutter-head, said nut being located in the longitudinal groove of said shaft; gearing, one member of which is attached to said feed-screw; a star-Wheel adapted to be applied to one oranother member of said gearing; and means for actuating said star-Wheel.

li. In a machine of the class specified, the combination with a boring-bar shaft of a cutter-head mounted on said shaft; a nut having a stud fitted in an aperture of the cutterhead, said nut being located in a longitudinal groove of the shaft; a feed-screw passing through said nut; gearing, one member of which is attached to said feed-screw; a device adapted to be applied to one or another member of said gearing; and means for intermittingly actuating said device upon the rotation of the boring-bar shaft.

l5. In a machine of the class specified, the combination,with a boring-bar shaft, of a cntter-head mounted thereon and consisting of a collar; an interchangeable arm or bracket attached to said collar and shaped to fit the periphery thereof; and a boring-tool carried by said arm or bracket.

16. The combination, with a shaft, of a collar secured thereto; interchangeable arms or brackets attached to said collar and each shaped to fit the periphery thereof; and borin g-tools carried by said brackets.

I7. The combination, With a shaft, of a cutter-head secured thereto, said cutter-head comprising interchangeable arms or brackets shaped to fit the periphery thereof; and boring tools adjustably mounted on said brackets.

1S. The combination, with a shaft, of a collar keyed thereon; shoes carried by the collar and bearing at different points upon the periphery of the shaft; interchangeable arms or brackets attached to said collar and shaped to fit the periphery thereof; and boring-tools carried by said arms or brackets.

19. An attachment for machines consisting of a block having a series of steps adapted to fit various-sized openings; a center; and a device carried by the block for adjusting said center.

20. A cutter-head comprising a collar and Ymeans for securing the same at different points to a shaft; a grooved interchangeable block attached to said collar; a device fitted in the groove of said block; a tool-holder pivoted to said device; a cutting-tool mounted in said tool-holder; means for adjusting said cutting-tool; and means for adjustably securing the device carrying the tool-holder to the block.

2l. The combination with aboring-barshaft and a cutter-head carrying a boring-tool mounted thereon of a feed-screw for actuating vsaid cutter-head in either direction; a gear attached to one end of said screw; a second gear mounted adjacent to the rst-nained gear; a star-Wheel having a hub adapted to fit the hub of either of said gears; and means for intermittingly actuating said star-Wheel.

22. In a machine of the class specified, the combination with a boring-bar shaft and a cutter-head having a boring-tool carried thereby of means forsustaining said shaft at both ends of the cylinder to be bored; a sectional ball member clamped to the shaft at'all points of the circumference thereof; a journal-box for sustaining said ball member; and a gear- Wheel for operating the boring-bar shaft also clamped to said shaft at all points ofathe circumference thereof.

23. In a machine of the class specified, the combination,\vith aboring-barshaft, of brackets for adjustablysustaining said shaft upon the cylinder to be bored; a split or divided bail member clamped to the shaft at all points around the circumference thereof; a journalbearing for said ball member; means for clamping said journal-bearing to the brackets; and means connected with said brackets for adjusting the journal-bearing in a line perpendicular to the axis of said shaft.

24:. In a machine of the class specified, the combination With a boring-bar shaft and a cutter-head mounted thereon of means for sustaining said shaft at one end of the cylinder to be bored; brackets adjustably connected to the cylinder at the other end of the same; a sectional ball member carried by the shaft; a journal-box for sustaining said ball member, said journal-box having an arm projecting from each side of the same; means carried by the brackets attached to the cylinder for adjusting the journal-box, and consequently the ball member' and shaft, in a line perpendicular to the longitudinal axis of the shaft; and means for clamping the arms of said journal-box to said brackets.

IOO

IIO

IIS

25. The combination,withaboring-barshaft, of a cutter-head mounted thereon; a screwr for feeding said cutter-head to its work; a device for actuating said screw; an annular frame carrying means With which said device engages; a bearing carried by the boring-bar shaft over which said frame is itted; and a stop-rod carried by said annular frame.

26. The combination, with a boring-bar shaft, of a cutter-head mounted thereon; a screw for feedingsaid cutter-head toits Work; a star-Wheel for intermittingly actuating said screw; an annular frame carrying a series of studs or rollers and having an arm; a disk carried by the boring-bar shaft.; a stud carried by said arm; and a stop-rod secured to said stud.

27. A cutter-head comprising a body portion in the shape of a collar; aseries of arms or brackets shaped to t the periphery of said collar and detachably secured thereto, each of said arms or brackets having a slot and a groove; a shoe having a rib fitted in said l:groove and adj ustably attached to the cutterhead by clamping means passing,` through the slot; a tool-holder pivoted to said shoe and havingatongue ittingin a groove of the shoe; a cutting-tool adj ustably secured to the toolholder; and means for adjusting saidtoolholder on its pivot.

28. A cutter-head consisting of a block or collar, a series of interchangeable arms or brackets, grooved and slotted on their front faces, detachably secured to said collar; a radially-adj ustable shoe fitted to the front face of each of said brackets; a tool-holder mounted for swinging movement in each of said shoes and provided with a grooved face for receiving the euttingtool; means for clamping said tool when adjusted; and a screw carried by the tool-holder and bearing against the shoe. p

29. An attachment for machines consisting of a block having a series of concentric steps of different diameters; a nut carried by said block; a threaded center; and a bushing carried by said center.

HENRY K. LEE.

Witnesses:

WM. H. BLODGETT, HENRY BIssnLL. 

